Tudor black bay 31, 31mm 316l steel case with polished and satin finish, light champagne-colour, stainless steel bezel with polished and satin finish, manufacture calibre MT5201 (COSC) self-winding mechanical movement with bidirectional rotor system integrated construction, stainless steel bracelet, polished and satin finish, with Tudor “t-fit” folding clasp and safety catch, flat sapphire crystal, waterproof to 100m (330 ft)